go back on ones word食言
He never goes back on his word.
他从不食言。
He would rather die than go back on his friends.
他宁死也不出卖我们的朋友。
A:Something must be wrong with Bob recently.
近期Bob有点不太对劲。
B:Yeah,hes in a bad mood,coz some of his friends have gone back on him.
是的,他心情不好,由于他的一些朋友背叛了他。



